/* =========================================================
   球速体育 SQNW, GO — 全站共享样式 /assets/site.css
   设计体系：速度感编辑部 · 左右分屏 · 粗野主义细节
   ========================================================= */

/* ---------- CSS 变量 ---------- */
:root {
  /* 色板 */
  --c-deep:   #0A1E2F;
  --c-ink:    #0D2B3E;
  --c-neon:   #39FF14;
  --c-orange: #FF6633;
  --c-paper:  #F4F1EA;
  --c-dark:   #101418;
  --c-white:  #FFFFFF;
  --c-mist:   #8899A6;
  --c-border: #1E3A4D;

  /* 字体 */
  --font-head: Impact, Haettenschweiler, 'Arial Black', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  /* 字号 */
  --s-h1: clamp(3rem, 7vw, 6rem);
  --s-h2: clamp(2.25rem, 5vw, 4rem);
  --s-h3: clamp(1.5rem, 3.5vw, 2.5rem);
  --s-h4: clamp(1.25rem, 2.5vw, 1.75rem);
  --s-body: 1.125rem;
  --s-small: 0.875rem;

  /* 布局 */
  --header-h: 4rem;
  --container-w: 1440px;

  /* 动效 */
  --t-fast: 0.16s ease;
  --t-normal: 0.28s ease;
  --t-slow: 0.45s cubic-bezier(0.22, 1, 0.36, 1);

  /* 阴影 */
  --shadow-card: 6px 6px 0 rgba(0, 0, 0, 0.28);
  --shadow-lift: 0 10px 24px rgba(0, 0, 0, 0.28);
}

/* ---------- Reset 与基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 0.75rem);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background: var(--c-deep);
  overflow-wrap: break-word;
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--s-body);
  line-height: 1.75;
  color: var(--c-paper);
  background: var(--c-deep);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: 0;
  cursor: pointer;
}

ul,
ol {
  list-style: none;
}

#main-content {
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

::selection {
  background: var(--c-neon);
  color: var(--c-deep);
}

/* ---------- 中文排版 ---------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: 0.02em;
  color: var(--c-paper);
  text-wrap: balance;
}

h1 { font-size: var(--s-h1); }
h2 { font-size: var(--s-h2); }
h3 { font-size: var(--s-h3); }
h4 { font-size: var(--s-h4); }

p {
  margin: 0;
}

/* ---------- 工具类 ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.text-neon { color: var(--c-neon); }
.text-orange { color: var(--c-orange); }
.text-mist { color: var(--c-mist); }

.bg-paper {
  background: var(--c-paper);
  color: var(--c-deep);
}
.bg-paper h1,
.bg-paper h2,
.bg-paper h3,
.bg-paper h4,
.bg-paper h5,
.bg-paper h6 {
  color: var(--c-deep);
}

.bg-ink {
  background: var(--c-ink);
  color: var(--c-paper);
}

.bg-deep {
  background: var(--c-deep);
  color: var(--c-paper);
}

.vertical-text {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.18em;
}

.shadow-hard {
  box-shadow: 6px 6px 0 var(--c-dark);
}

.has-speed-line {
  background-image: repeating-linear-gradient(
    -55deg,
    rgba(57, 255, 20, 0.07) 0,
    rgba(57, 255, 20, 0.07) 1px,
    transparent 1px,
    transparent 14px
  );
}

/* ---------- 布局容器 ---------- */
.container {
  width: min(100% - 2rem, var(--container-w));
  margin-inline: auto;
}

.container--narrow {
  max-width: 960px;
}

.container--wide {
  max-width: 1600px;
}

.section {
  padding-block: clamp(3rem, 8vw, 5.5rem);
}

.page-wrap {
  min-height: 60vh;
  padding-block: clamp(2rem, 5vw, 4rem);
}

.page-hero {
  padding-block: clamp(2.5rem, 7vw, 5rem);
  border-bottom: 2px solid var(--c-border);
}

.page-hero .page-title {
  margin-top: 0.5rem;
}

.page-hero .page-desc {
  max-width: 62ch;
  margin-top: 1rem;
  font-size: 1.125rem;
  color: var(--c-mist);
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-cols-1 { grid-template-columns: minmax(0, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8125rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition:
    background-color var(--t-fast),
    color var(--t-fast),
    border-color var(--t-fast),
    box-shadow var(--t-fast),
    transform var(--t-fast);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

.btn--primary {
  background: var(--c-neon);
  color: var(--c-deep);
}

.btn--primary:hover {
  background: var(--c-orange);
}

.btn--ghost {
  background: transparent;
  border-color: var(--c-border);
  color: var(--c-paper);
}

.btn--ghost:hover {
  border-color: var(--c-neon);
  color: var(--c-neon);
}

.btn--block {
  display: flex;
  width: 100%;
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.6;
  white-space: nowrap;
}

.tag--neon {
  background: var(--c-neon);
  color: var(--c-deep);
}

.tag--orange {
  background: var(--c-orange);
  color: var(--c-deep);
}

.tag--outline {
  border: 1px solid var(--c-border);
  color: var(--c-paper);
}

.tag--paper {
  background: var(--c-paper);
  color: var(--c-deep);
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  background: var(--c-ink);
  border: 2px solid var(--c-border);
  box-shadow: var(--shadow-card);
  padding: 1.5rem;
  transition:
    transform var(--t-fast),
    box-shadow var(--t-fast),
    border-color var(--t-fast);
}

.card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.32);
  border-color: var(--c-neon);
}

.card--paper {
  background: var(--c-paper);
  border-color: var(--c-deep);
  box-shadow: 6px 6px 0 var(--c-dark);
  color: var(--c-deep);
}

.card--paper:hover {
  border-color: var(--c-orange);
}

/* ---------- 章节标题组 ---------- */
.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "eyebrow aside"
    "title aside";
  align-items: end;
  column-gap: 1.5rem;
  row-gap: 0.25rem;
  margin-bottom: 2rem;
}

.section-head .eyebrow {
  grid-area: eyebrow;
  justify-self: start;
}

.section-head .section-title {
  grid-area: title;
}

.section-head .section-aside {
  grid-area: aside;
  writing-mode: vertical-rl;
  padding-bottom: 0.25rem;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--c-mist);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-neon);
}

.eyebrow::before {
  content: "";
  width: 2rem;
  height: 2px;
  background: var(--c-orange);
  flex-shrink: 0;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  margin-bottom: 1.5rem;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem 0.75rem;
  font-size: 0.875rem;
  color: var(--c-mist);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.breadcrumb li + li::before {
  content: "/";
  font-weight: 800;
  color: var(--c-neon);
}

.breadcrumb a {
  color: var(--c-paper);
  transition: color var(--t-fast);
}

.breadcrumb a:hover {
  color: var(--c-neon);
}

.breadcrumb [aria-current="page"] {
  color: var(--c-mist);
}

/* ---------- 正文内容 ---------- */
.content {
  max-width: 65ch;
}

.content p {
  margin-bottom: 1.25em;
}

.content a {
  color: var(--c-neon);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.content a:hover {
  color: var(--c-orange);
}

.content h2,
.content h3 {
  margin-top: 2em;
  margin-bottom: 0.6em;
}

.content ul,
.content ol {
  margin-bottom: 1.25em;
}

.content ul li {
  position: relative;
  padding-left: 1.5em;
  margin-bottom: 0.5em;
}

.content ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 0.5em;
  height: 0.5em;
  background: var(--c-orange);
  transform: skew(-20deg);
}

.content ol {
  counter-reset: list-count;
}

.content ol li {
  position: relative;
  padding-left: 1.75em;
  counter-increment: list-count;
  margin-bottom: 0.5em;
}

.content ol li::before {
  content: counter(list-count, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-size: 0.875rem;
  font-weight: 800;
  color: var(--c-neon);
}

.content blockquote {
  border-left: 4px solid var(--c-neon);
  padding-left: 1.25rem;
  margin-bottom: 1.25em;
  color: var(--c-mist);
  font-style: italic;
}

.content strong {
  font-weight: 800;
  color: var(--c-white);
}

.content--paper {
  color: var(--c-deep);
}

.content--paper a {
  color: var(--c-dark);
  text-decoration-color: var(--c-orange);
}

.content--paper strong {
  color: var(--c-deep);
}

/* ---------- 图片占位容器 ---------- */
.img-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--c-ink);
  border: 2px solid var(--c-border);
  overflow: hidden;
}

.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--t-normal);
}

.img-frame:hover img {
  transform: scale(1.02);
}

.img-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(115deg, transparent 35%, rgba(57, 255, 20, 0.12) 50%, transparent 65%);
  transform: translateX(-120%);
  transition: transform 0.6s ease;
}

.img-frame:hover::before {
  transform: translateX(120%);
}

.img-frame[data-label]::after {
  content: attr(data-label);
  position: absolute;
  left: 0.75rem;
  bottom: 0.75rem;
  z-index: 1;
  background: var(--c-deep);
  color: var(--c-neon);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.625rem;
  border-left: 3px solid var(--c-orange);
}

.img-frame--tall {
  aspect-ratio: 3 / 4;
}

.img-frame--wide {
  aspect-ratio: 21 / 9;
}

/* ---------- 速度线分隔 ---------- */
.speed-divider {
  display: block;
  height: 4px;
  border: 0;
  background: linear-gradient(90deg, var(--c-neon) 0%, var(--c-orange) 40%, var(--c-border) 85%, transparent 100%);
  margin-block: 2.5rem;
}

/* ---------- Skip Link 与焦点 ---------- */
.skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 2000;
  padding: 0.75rem 1.25rem;
  background: var(--c-neon);
  color: var(--c-deep);
  font-size: 0.875rem;
  font-weight: 800;
  text-decoration: none;
  transform: translateY(-240%);
  transition: transform var(--t-normal);
}

.skip-link:focus {
  transform: translateY(0);
}

:focus-visible {
  outline: 3px solid var(--c-neon);
  outline-offset: 2px;
}

/* ---------- 品牌标识 ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
  color: var(--c-paper);
  text-decoration: none;
}

.brand-logo {
  position: relative;
  display: block;
  width: 42px;
  height: 42px;
  background: var(--c-neon);
  clip-path: polygon(0 0, 78% 0, 100% 22%, 100% 100%, 22% 100%, 0 78%);
  flex-shrink: 0;
}

.brand-logo::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--c-deep);
  clip-path: polygon(0 82%, 82% 0, 100% 0, 22% 100%);
}

.brand-logo::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 45%;
  height: 45%;
  background: var(--c-orange);
  clip-path: polygon(60% 100%, 100% 60%, 100% 100%);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-name {
  font-family: var(--font-head);
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  line-height: 1.1;
  color: var(--c-paper);
}

.brand-code {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--c-mist);
}

.brand--footer .brand-logo {
  width: 48px;
  height: 48px;
}

.brand--footer .brand-name {
  font-size: 1.75rem;
}

.brand--footer .brand-code {
  font-size: 0.75rem;
}

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background:
    repeating-linear-gradient(
      -45deg,
      rgba(255, 255, 255, 0.015) 0,
      rgba(255, 255, 255, 0.015) 1px,
      transparent 1px,
      transparent 10px
    ),
    var(--c-deep);
  border-bottom: 2px solid var(--c-border);
  transition: box-shadow var(--t-normal);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-neon) 0%, var(--c-orange) 70%, var(--c-border) 100%);
  z-index: 2;
}

.site-header[data-scrolled] {
  box-shadow: var(--shadow-lift);
}

.scroll-track {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 3px;
  z-index: 2;
  pointer-events: none;
}

.scroll-bar {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--c-neon), var(--c-orange));
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(100% - 2rem, var(--container-w));
  margin-inline: auto;
  min-height: var(--header-h);
}

.header-left {
  display: flex;
  flex: 1;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.5rem);
}

.header-left::after {
  content: "";
  width: 2px;
  height: 1.5rem;
  background: linear-gradient(to bottom, var(--c-neon), var(--c-border));
  opacity: 0.55;
  flex-shrink: 0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.5vw, 1.25rem);
}

.header-ticker {
  border-left: 3px solid var(--c-orange);
  padding-left: 0.625rem;
  margin-right: 0.25rem;
  font-size: 0.625rem;
  font-weight: 800;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-mist);
  white-space: nowrap;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: clamp(0.25rem, 1vw, 0.875rem);
}

.header-nav-link {
  position: relative;
  display: inline-block;
  padding: 0.625rem 0.375rem;
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--c-paper);
  white-space: nowrap;
  transition: color var(--t-fast);
}

.header-nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 100%;
  height: 2px;
  background: var(--c-neon);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-fast);
}

.header-nav-link:hover {
  color: var(--c-neon);
}

.header-nav-link:hover::after,
.header-nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.header-nav-link[aria-current="page"] {
  color: var(--c-neon);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-search-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--c-border);
  color: var(--c-paper);
  transition: color var(--t-fast), border-color var(--t-fast);
}

.header-search-btn:hover {
  color: var(--c-neon);
  border-color: var(--c-neon);
}

.header-login-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  height: 38px;
  padding: 0 1rem;
  background: var(--c-neon);
  color: var(--c-deep);
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  border: 2px solid var(--c-neon);
  transition:
    background-color var(--t-fast),
    border-color var(--t-fast),
    color var(--t-fast);
}

.header-login-btn:hover {
  background: var(--c-orange);
  border-color: var(--c-orange);
  color: var(--c-deep);
}

.login-label {
  line-height: 1;
}

.icon {
  display: block;
  flex-shrink: 0;
}

/* ---------- 移动菜单按钮 ---------- */
.nav-toggle {
  display: none;
  position: relative;
  width: 42px;
  height: 38px;
  border: 1px solid var(--c-border);
  background: transparent;
  align-items: center;
  justify-content: center;
  transition: border-color var(--t-fast), background-color var(--t-fast);
}

.nav-toggle:hover {
  border-color: var(--c-neon);
  background: rgba(57, 255, 20, 0.06);
}

.nav-toggle-bar {
  position: absolute;
  left: 10px;
  right: 10px;
  height: 2px;
  background: var(--c-paper);
  transition:
    top var(--t-fast),
    transform var(--t-fast),
    opacity var(--t-fast),
    background-color var(--t-fast);
}

.nav-toggle-bar:nth-child(1) { top: 10px; }
.nav-toggle-bar:nth-child(2) { top: 18px; }
.nav-toggle-bar:nth-child(3) { top: 26px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  top: 18px;
  transform: rotate(45deg);
  background: var(--c-neon);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  top: 18px;
  transform: rotate(-45deg);
  background: var(--c-neon);
}

/* ---------- 移动导航面板 ---------- */
.nav-panel {
  display: none;
}

.mobile-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  padding: 0.75rem;
}

.mobile-nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 1rem 0.875rem;
  font-family: var(--font-head);
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--c-paper);
  text-decoration: none;
  border-bottom: 1px solid var(--c-border);
  opacity: 0;
  transform: translateX(-8px);
  transition-property: opacity, transform, color, background-color;
  transition-duration: var(--t-normal), var(--t-normal), var(--t-fast), var(--t-fast);
}

.mobile-nav-link::before {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--c-neon);
}

.mobile-nav-link:nth-child(1)::before { content: "01"; }
.mobile-nav-link:nth-child(2)::before { content: "02"; }
.mobile-nav-link:nth-child(3)::before { content: "03"; }
.mobile-nav-link:nth-child(4)::before { content: "04"; }
.mobile-nav-link:nth-child(5)::before { content: "05"; }
.mobile-nav-link:nth-child(6)::before { content: "06"; }

.mobile-nav-link:hover,
.mobile-nav-link[aria-current="page"] {
  color: var(--c-neon);
  background: rgba(57, 255, 20, 0.06);
}

.mobile-nav-label {
  display: inline-block;
}

.nav-panel-note {
  padding: 0.75rem 1.25rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--c-mist);
  border-top: 1px solid var(--c-border);
  background: rgba(255, 255, 255, 0.02);
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--c-dark);
  color: var(--c-paper);
  border-top: 2px solid var(--c-border);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--c-neon) 0%, var(--c-orange) 65%, var(--c-border) 100%);
}

.footer-inner {
  width: min(100% - 2rem, var(--container-w));
  margin-inline: auto;
  padding-block: 3.5rem 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 5fr 2fr 2fr 3fr;
  gap: 2.5rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.footer-vol {
  font-family: var(--font-head);
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-orange);
  border-left: 3px solid var(--c-neon);
  padding-left: 0.75rem;
}

.footer-statement {
  max-width: 42ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-mist);
}

.footer-col h3 {
  margin-bottom: 1rem;
}

.footer-heading {
  font-size: 0.8125rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-neon);
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  font-size: 0.9375rem;
  color: var(--c-mist);
  transition: color var(--t-fast), padding-left var(--t-fast);
}

.footer-links a:hover {
  color: var(--c-neon);
  padding-left: 4px;
}

.footer-contact li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.625rem;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--c-mist);
}

.footer-contact li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  background: var(--c-neon);
}

.footer-contact-note {
  margin-top: 0.75rem;
  font-size: 0.8125rem;
  color: var(--c-mist);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--c-border);
  font-size: 0.8125rem;
  color: var(--c-mist);
}

.footer-copy span[data-year] {
  color: var(--c-white);
  font-weight: 700;
}

.footer-icp {
  color: var(--c-mist);
}

/* ---------- 滚动显现协议 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.js [data-reveal][data-revealed] {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1199px) {
  .header-nav-secondary {
    display: none;
  }

  .header-ticker {
    display: none;
  }

  .header-left::after {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-panel {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--c-ink);
    border-bottom: 3px solid var(--c-border);
    box-shadow: 0 14px 28px rgba(0, 0, 0, 0.35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity var(--t-fast), transform var(--t-fast), visibility var(--t-fast);
  }

  .nav-panel[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-panel[data-open] .mobile-nav-link {
    opacity: 1;
    transform: translateX(0);
  }

  .nav-panel[data-open] .mobile-nav-link:nth-child(1) { transition-delay: 0.04s; }
  .nav-panel[data-open] .mobile-nav-link:nth-child(2) { transition-delay: 0.08s; }
  .nav-panel[data-open] .mobile-nav-link:nth-child(3) { transition-delay: 0.12s; }
  .nav-panel[data-open] .mobile-nav-link:nth-child(4) { transition-delay: 0.16s; }
  .nav-panel[data-open] .mobile-nav-link:nth-child(5) { transition-delay: 0.2s; }
  .nav-panel[data-open] .mobile-nav-link:nth-child(6) { transition-delay: 0.24s; }
}

@media (max-width: 1023px) {
  .grid-cols-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-cols-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 767px) {
  :root {
    --header-h: 3.5rem;
  }

  .header-nav-primary {
    display: none;
  }

  .header-right {
    gap: 0.375rem;
  }

  .header-actions {
    gap: 0.375rem;
  }

  .brand-logo {
    width: 36px;
    height: 36px;
  }

  .brand-name {
    font-size: 1.125rem;
  }

  .brand-code {
    letter-spacing: 0.14em;
  }

  .header-login-btn {
    width: 38px;
    padding: 0;
  }

  .login-label {
    display: none;
  }

  .mobile-nav {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2.25rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    margin-top: 2rem;
  }

  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .img-frame--wide {
    aspect-ratio: 16 / 9;
  }
}

@media (max-width: 479px) {
  .site-header .brand-code {
    display: none;
  }

  .header-search-btn {
    width: 34px;
    height: 34px;
  }

  .header-login-btn {
    width: 34px;
    height: 34px;
  }

  .nav-toggle {
    width: 38px;
    height: 34px;
  }
}

/* ---------- 无障碍：减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .scroll-track,
  .scroll-bar {
    display: none;
  }

  .mobile-nav-link {
    opacity: 1;
    transform: none;
  }

  .nav-panel {
    transition: none;
  }

  .img-frame::before {
    display: none;
  }

  .img-frame img,
  .card,
  .btn,
  .header-nav-link,
  .footer-links a,
  .header-login-btn,
  .header-search-btn {
    transition: none;
  }

  .skip-link {
    transition: none;
  }
}